Let $f$ be any function defined on set $\Bbb N$.if $f(xy)=f(x)+f(y)$ & $f(2)=9$ then find $f(3)$ and answer for this question is $7$ . Please say how to get it.
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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